Denon AVR-X6400H review & specs

Votes 23 23
Rating 3.1 3.1

Denon AVRX6400H: feel all the benefits of modern technologies

Denon AVRX6400H

Denon AVRX6400H is really one if the most decent receivers, because such a compact box powers 11 channels, has a high-frequency response (20 Hz-20 kHz) and works well without the external amplifier. Moreover, the device can boast of a plenty of HDMI inputs and Audyssey XT32 room correction. Those features are impressive, but after a Denon AVRX6400H review, it was easy to notice that the true list of useful peculiarities includes much more interesting functions and integrated technologies.

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I wasn’t surprised to see, that the Denon AVRX6400H is a strict black box with a classic appearance. Due to the brushed metal front part, the device looks presentable and hides all the extra outputs and inputs. I’ve tested a black model, but I know that Denon offers also a silver envelope. Such diversity is awesome because a user may choose the desired color, which will fit his/her preferences. The informative display reflects all the information clear and bright. Chunky remote is pleasant for use and very reliable. After falling from a great height it stayed safe and sound. All the buttons were very responsible. I have to mention that after a few working hours the corps was very warm, so I had to take care of cooling. Overheating is a serious Denon problem. After a cooling fan system purchasing and installation, the problem was solved, but I had to spend additional money to keep the AVRX6400H “alive”.


I liked the fact, that the Denon AVRX6400H has presented both connections to Wi-Fi and Bluetooth. I have tested the Spotify, Deezer, Tidal, AirPlay, etc, and the result was satisfactory. Thanks to the HEOS app the steaming process was very easy and could control the volume directly from my smartphone. A pleasant surprise for me became an appearance of Alexa technology. I could start and choose tracks with my voice, by saying a few phrases. The system worked well, and Alexa “heard” my voice even from the distance. 40 FM/AM preset stations, sleep timer, and integrated clock became a pleasant bonus for me.


It was amazing, that after the AVRX6400H installation the picture became much better, than with the previous receiver that I’ve tested. I even saw all the details and the colors diversity because they were very bright and juicy. The receiver was bought specially to go with a new 4K OLED TV, but now I don’t see the need to purchase it. The unit has changed my plans for the better.

Sound Quality

Firstly I have checked the sound quality of Atmos films. Sounds moved easily between channels, there were no shifts in tone or volume. During the amazing action scenes with explosion and bullets flying, I felt myself in a middle of the involved locations. Even quiet scenes were represented with an amazing atmosphere. Thanks to the frequencies balance, the dialogues were clear and it was impossible not to embrace the drama. The music performed perfectly. It was easy to hear all the distinct elements. Every musical instrument sounded clear and vivid. At the same time, I felt the sound harmony and that made me feel on the 7th cloud. I wasn’t impressed by the low-frequency containment. Usually, such technology keeps bass energy in the room, but in reality, it sounded like the system doesn’t have a bass at all. The Auro-3D surround format is not very popular, but owing to it I enjoyed the three-dimensional sound fields.


The Denon AVRX6400H has 8 HDMI inputs and 3 outputs. By the way, all of them are DCP2.2 certified, so I truly enjoyed the Ultra HD 4K and HDR content. With the help of 3 outs, I have checked the ability to display an image on 2 different devices simultaneously. TV and projector worked great, the connection was made after the first attempt. Among the very impressive Denon AVRX6400H specs, the device surprised me with the presence of a Moving Magnet phono cartridge input. I am a lover of legacy analog formats so thanks to this feature I had an opportunity to enjoy my vinyl collection.


The Denon AVRX6400H setting was quick and precise. An on-screen GUI was represented in a colorful and informative way. There were all the aspects of the setup routine, starting with wireless connection and ending with the speaker’s calibration. The system took care of all the moments and I even didn’t have to use a manual. The only thing, which confused me, was the inputs renaming. It wasn’t clear how to do it with the help of the on-screen GUI, so I used the iOS app. In general, the setup process took me less than hour, including connecting speakers, devices and finding out how to use the Audyssey XT32. A user can set EQ range and make it works up only to a certain frequency range. As for me, I chose an upper-limit of 500Hz. Such settings allowed the Denon to fix all the bass issues but remain unchanged the midrange sound of my KEF speakers.


The Denon AVRX6400H is not a perfect device, but it has all the most interesting and useful features. The testing process was almost clear and I didn’t notice some awful malfunctions. The unit can offer 11 channels, high-frequency response (20 Hz-20 kHz), 8 HDMI inputs, Audyssey XT32 room correction, Wi-Fi, Bluetooth, Atmos, Spotify, Deezer, Auro-3D, Tidal, AirPlay, Alexa technology, and other modern features. Overheating, inputs renaming and low-frequency containment raised some questions.

Common features


Denon AVR-X6400H






4.4 of 5




Total output power

1180 W

Output power per channel

140 W

Output impedance per channel

4 Ohm

Frequency response

20 Hz-20 kHz

Total harmonic distortion

0.05 %

Number of channels


Signal-to-noise ratio

110 dB


Digital player

Internet radio

Network audio player

Audio formats



Apple lossless





Built-in decoders


Dolby Atmos

Dolby digital plus

Dolby surround

Dolby true HD

Built-in display





Connectivity interfaces



IEEE 802.3

IEEE 802.3u

Signal processing

HDMI pass-through

up to 4K

Video conversion/scaling

HDMI to HDMI scaling, analog to HDMI up conversion

3D pass-through

Upscaling via HDMI

up to 4K

Connector type

AV inputs


Optical digital inputs


Coaxial digital inputs


HDMI inputs


HDMI outputs


Optical digital outputs

has not

Coaxial digital outputs

has not

Subwoofer outputs






Media content source





Tuner type


Tuner bands


Preset station


Additional features

A-B speaker switch

Three-zone capability

Advanced sound retriever (ASR) technology

Apple air-play support

Audio return channel (ARC)


Auto power off

Pure direct mode

Dual-zone capability

Smartphone remote control

Sound features

Audio D/A converter

32bit / 192kHz

Surround sound effects

Dolby Surround

Surround system class

11.2 channel

Digital content protection

HDCP 2.2


Built-in clock

Sleep timer

Power device

Operational power consumption

720 W

Standby power consumption

0.15 W

User manual




15.1 x 17.1 x 6.6 inches


32 pounds
Denon AVR-X6400H
Denon AVR-X6400H

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